/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright (c) 2008-2009, The KiWi Project (http://www.kiwi-project.eu)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice, 
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice, 
 *   this list of conditions and the following disclaimer in the documentation 
 *   and/or other materials provided with the distribution.
 * - Neither the name of the KiWi Project nor the names of its contributors 
 *   may be used to endorse or promote products derived from this software 
 *   without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
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 * 
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 */
package kiwi.core.extension;

import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;

/**
 * This class implements an extended resource resolver for looking up JSF resources inside jar
 * files. The implementation is described on http://www.seamframework.org/Community/SeamPlugins
 * 
 * @author Sebastian Schaffert
 *
 */
public class KiWiResourceResolver extends DefaultResourceResolver implements ResourceResolver {
	@Override
	public URL resolveUrl(String resource) {
		
		// first, try to retrieve the JSF resource from the main KiWi application view
		URL resourceUrl = super.resolveUrl(resource);
		
		// if not found, search the extensions for the file
		if (resourceUrl == null) {
			if (resource.startsWith("/")) {
				resource = resource.substring(1);
			}
			
			// the first part of the path is the extension identifier; we split the path at the
			// first "/" into the extension identifier and the actual resource ...
			if(resource.contains("/")) {
				String[] components = resource.split("/",2);
				
				// try to find all resources matching components[1] and check whether they are contained in
				// the right jar file
				try {
					Enumeration<URL> en = Thread.currentThread().getContextClassLoader().getResources(components[1]);
					
					while(en.hasMoreElements()) {
						resourceUrl = en.nextElement();
						
						if(resourceUrl.getPath().contains("kiwiext-"+components[0]+".jar")) {
							break;
						}
					}
					
				} catch (IOException e) {
					// should not happen
					e.printStackTrace();
				}
				
				//resourceUrl = Thread.currentThread().getContextClassLoader().getResource(resource);
			}
			
		}
		
		return resourceUrl;
	}
	
	
}
